Process of gemming insoles



Jan. 2, 1934.. E. A. ELLIS PROCESS OF GEMMING IN SOLES Filed Oct. 31, 1930 o xvvv... 3

UNlTE STATES ATET PROCESS OF GEMMING INSOLES Elmer A. Ellis, Medford, Mass.

Application October 31, 1930. Serial No. 492,428

1 Claim. (Cl. 12-146) FFECE My present invention is an improvement in the apply a coating of adhesive 6, said adhesive having art of preparing insoles for use in the manua special affinity for the leather and canvas layer. facture of boots and shoes and is directed more This coating is applied on the flesh side of the particularly to the so-called gemmed insole. leather constituting the insole 1 and is prefer- 5 Heretofore it has been customary to utilize a ably of suitable consistency so as to remain in reinforcing layer of canvas or the like textile tacky condition for several hours or days. material on welt insoles to give a better sewing Thus with the prepared insole so treated same rib structure, thereby reinforcing both the insole can be coated in substantial quantities and and the rib with the canvas and permitting shipped and used when ready. l0 thin and cheap leather to be utilized for the in- To constitute the reinforcing layer I prefer to sole. Such prior gemming processes have utilized coat the canvas 7 in any narrow strips of special a specially prepared and treated canvas which Width for the mamTmum required for the type had to have a priming or friction coating of of insole being gemmed and then coat the same ,rubber or the like, generally rubber and cement, of appropriate length from heel to toe and ap- 15 in order to adhere to the adhesive utilized to hold ply the canvas to the tacky surface of the prethe canvas layer and leather insole together. viously coated insole. Preferably also, as I am In my present invention I eliminate the necesusing relatively narrow strips of canvas I may sity for specially treating the canvas for gemming coat the edge portions as indicated at 9 and insoles and also eliminate the coating of the can- 10 which will keep same from unraveling and 20 vas with adhesive and, furthermore, utilize a practically give the effect of a selvage edge along I simple method of applying the reinforcing layer the sewing rib at the forepart where a selvage is and, preferably, treat the insole alone with a desirable without the expense incident thereto. coating of adhesive which will permit the canvas Thus I am enabled to coat the canvas strips layer to be simply applied and pressed into shape from large sheets of substantially exact dimen- 25 by the usual pressing devices. While I can utilize sion as to Width, eliminating waste in the canplain canvas without the priming or friction coatvas, as well as of course eliminating the preing heretofore necessary, I may, and preferably vious operations of sizing, friction coating, or do, apply to the edge portion of the canvas a the like. The canvas '7 is then applied to the thin layer of a suitable adhesive to prevent ravelcoated insole 1 and the gemming processes 30 ing of the textile layer at the edge. This permits completed. 5 7

me to coat the canvas in very narrow strips of As shown in Figs. 4 and 5 the canvas layer 7 substantially correct width for the insole to which will preferably be gemmed with the coated edge it is applied, eliminating waste of the material portion substantially at the edges of the comand simplifying the subsequent trimming operaposite sewing rib, at which reinforcing, as illus- 35 tions. trated at the right in Fig. 5, occurs the greatest Referring to the drawing illustrating the prewidth of the forepart of the insole, the subseferred embodiment of the present invention, quent trimming operations, as shown at 12, at

Fig. l is a plan view of my prepared insole with the left of Fig. .5, completing the reinforced sewthe adhesive coating applied ready to receive the ing rib for the gemmed insole. 40 canvas; My present process greatly simplifies the steps Fig. 2 is a view of a sheet of reinforcing canvas and practices necessary, as well as the handling in its natural state without a priming or other operations, saving the friction coating or primcoating; ing on the canvas layer, as well as saving the Fig. 3 illustrates the application of the rehandling of same, presenting a prepared insole 45 inforcing to the prepared insole; capable of adhering directly to the canvas in its Fig. 4 shows the completed gemmed insole, and natural state, either with or Without the rein- Fig. 5 is a cross-sectional view on the line 5-5 forcing coating on the edges, and giving a much of Fig. 4. more desirable resulting article of manufacture. Referring to the drawing, 1 indicates a welt With my improved gemmed insole I eliminate 50 insole of any usual or desired style, size and conentirely the heretofore highly objectionable tour, wherein the same has been channeled difiiculties of the priming or rubber friction coataround the edge portion to form the sewing lip ing or adhesive on the canvas flowing through or rib comprised of the layers 3 and 5 cut from the sewing needle through the inseam stitching the channels 2 and 4 respectively. To the inner operation, which gummed up the needle and surface of the channeled portion of the insole I thread and rendered same highly objectionable. 0

pable of adhering to unpriined textile material, applying to the channeled and coated blank a textile reinforcing layer having an unprimed portion and an edge portion treated with an adhesive to prevent the edge from unraveling, fitting the unprimed portion to the base of the sewing rib and a part of the adhesive coated edge being adjacent the top of the sewing rib, trimming off the surplus reinforcing material, and completing by the usual processes.

ELMER A. ELLIS. 

